17 Language support library [support] (original) (raw)

17.3 Implementation properties [support.limits]

17.3.4 Floating-point type properties [fp.style]

17.3.4.2 Type float_­denorm_­style [denorm.style]

namespace std { enum float_denorm_style { denorm_indeterminate = -1, denorm_absent = 0, denorm_present = 1 };}

The presence or absence of subnormal numbers (variable number of exponent bits) is characterized by the values:

• denorm_­indeterminateif it cannot be determined whether or not the type allows subnormal values
• denorm_­absentif the type does not allow subnormal values
• denorm_­presentif the type does allow subnormal values